• Title/Summary/Keyword: Atmospheric deposition

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Mercury Exchange Flux from Two Different Soil Types and Affecting Parameters

  • Park, Sang-Young;Kim, Pyung-Rea;Han, Young-Ji
    • Asian Journal of Atmospheric Environment
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    • v.7 no.4
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    • pp.199-208
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    • 2013

  • Mercury exchange fluxes between atmosphere and soil surface were measured in two different types of soils; lawn soil (LS) and forest soil (FS). Average Hg emission from LS was higher than from FS although the soil Hg content was more than 2 times higher in forest soil. In LS, Hg emissions were much greater in warm season than in cold season; however, deposition was dominant in FS during warm season because of leafy trees blocking the solar radiation reaching on the soil surface. In both LS and FS, Hg fluxes showed significantly positive correlations with UV radiation and soil surface temperature during cold season. In addition, it was observed that emission showed positive correlation with UV radiation and soil temperature while there was negative relationship between deposition and UV radiation.

  • https://doi.org/10.5572/ajae.2013.7.4.199 인용 PDF KSCI

Creation of Diamond/Molybdenum Composite Coating in Open Air

  • Ando, Yasutaka;Tobe, Shogo;Tahara, Hirokazu
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.1313-1314
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    • 2006

  • For improvement of wear resistance property of atmospheric thermal plasma sprayed molybdenum (Mo) coating, diamond deposition on the atmospheric plasma sprayed molybdenum coating by the combustion flame chemical vapor deposition (CFCVD) has been operated. In this study, to diminish the thermal damage of the substrate during operation, a thermal insulator was equipped between substrate and water-cooled substrate holder. Consequently, diamond particles could be created on the Mo coating without fracture and peeling off. From these results, it was found that this process had a high potential in order to improve wear resistance of thermal sprayed coating.

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The Characteristics of the Dry Deposition Velocity for O3 regarding Surface Wetness (지표면 Wetness에 따른 오존의 건성침적속도 특성)

  • 이화운;김유근;문난경
    • Journal of Environmental Science International
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    • v.12 no.4
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    • pp.393-397
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    • 2003

  • It has been researched the relationship between deposition velocity and factors which could affect the deposition phenomena and deposition velocity also has been estimated fer several land-use types. The typical deposition velocities are complex functions of surface types, atmospheric stabilities, friction velocities, air pollutants and so on. The canopy resistance is major contribution to the model's total resistance for O₃. Canopy wetness is also an important factor to calculate deposition velocity. We considered the canopy wetness as canopy water content(CWC) in our Model. But, it is not easy to observe CWC over each land-use types. In this study, we use CWC observed by EMEFS(CANADA Environment Service, 1988) to examine the influence of CWC in estimation of 03 dry deposition velocity(V/sub d/) in summertime. The value of O₃ V/sub d/ range 0.2 ∼ 0.7 cm s/sup -1/ on dry surface and 0.01 ∼ 0.35 cm s/sup -1/ on wet surface in daytime.

  • https://doi.org/10.5322/JES.2003.12.4.393 인용 PDF KSCI